Compressed Air Work And Diving 1909
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54
COMPRESSED AIR WORK.
the same apparatus as used at Rochester was employed
liere.*
The Forth Bridge caissons have been so much
written about and are so well known as to neecl no
description here, but for the purpose of comparison
with other types of caissons, a typical outline section
of them is given in Fig. 5.
The Victoria Bridge,i' Stockton-on-Tees, 1887,
cylinders were of cast iron, 14 ft. in diameter, and
ij in. metal. During the sinking of one of these
a fracture through which the air escaped appeared in
the bottom cast-iron length—the bottom length forming
* Proc. Inst. C. E., vol. xix.
t Proc. Inst. C. E., vol. cix.